6、rter:Telluswhathappenedyesterdaymorning.Boy:…TVreporter:So,whentherainstormsuddenlycame,whatwereyoudoing?Boy:…when与while表示:当......时的区分:①when:at or during the time that既指时间点,也可指一段时间while:during the time that只指一段时间while从句和主句的动作同时发生,两句都用过去进行时,必须是延续性动词.when从句的动作和主句的动作可以是同时,也可以是先后发生;可以是终止性动词,也可以是延